(57) Multiple displays (37a, 37b, 37c) are placed side by side. A key image (58a, 58b)
to be drag-and-dropped is displayed on a first display (37a). An actual drop target
area (56) into which the key image is to be dropped is displayed on the rest of the
displays. The key image is held by placing a cursor thereon and pressing a right click
button (42b) of a mouse (42). In response to this, a drop window (60) that is a reduced
image of the drop target area is displayed on the first display. The cursor is moved
onto the drop window by operating the mouse with the right click button pressed. Releasing
the right click button in a desired position in the drop window drops the key image.
Based on a drop position in the drop window, the key image is dropped in a corresponding
position in the actual drop target area.
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